Presentation	1998/11/20 A study of E2 higher order differential attack Yuji HORI, Toshinobu KANEKO,
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Abstract(in English)	The encryption algorithm E2 is a block cipher proposed by NTT as a candidate of Advanced Encryption Standard (AES). The Higher Order Differential Attack is the attacking method which applies the higher order differentials to the nonlinear function in the block cipher. In this paper, we study on the strength of 5-round E2 without IT and FT functions against the attack. As a result, attacking equations with 1st order differential are derived. For this equaiton we estimate that necessary chosen plain text pairs are 2^<24>, and the cpu-times for the attack is 22^<72> F-function operation.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	E2 / higher order differential attack
Paper #	ISEC98-38
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Conference Information
Committee	ISEC
Conference Date	1998/11/20(1days)
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Paper Information
Registration To	Information Security (ISEC)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	A study of E2 higher order differential attack
Sub Title (in English)
Keyword(1)	E2
Keyword(2)	higher order differential attack
1st Author's Name	Yuji HORI
1st Author's Affiliation	Department of Electronics Engineering, Science University of Tokyo()
2nd Author's Name	Toshinobu KANEKO
2nd Author's Affiliation	Department of Electronics Engineering, Science University of Tokyo
Date	1998/11/20
Paper #	ISEC98-38
Volume (vol)	vol.98
Number (no)	426
Page	pp.pp.-
#Pages	6
Date of Issue